Wildfires have broad impacts on the atmosphere, ecology, and society. This study leverages satellite data and chemistry-transport models to analyze the impact of wildfires on trace gases in California during the August-October periods of 2018, 2019, and 2020. During these months, Southern California experiences minimal precipitation, leading to a high Vapor Pressure Deficit, which results in decreased photosynthetic activities. This reduction, combined with increased biomass burning, causes a rise in CO₂ concentrations. Increased CO and CH₄ levels are also seen in TROPOMI retrievals tied to the increase in biomass burning. The CarbonTracker model captures these elevated CO₂ concentrations, though with a reduced amplitude of increased CO₂. Similarly, the GEOS-Chem model successfully simulates high CO levels but underestimates the observed enhancements. These findings will improve the understanding of fire's influence on trace gases and refine future numerical models on surface emissions and transport.

中文翻译：

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加州野火对 CO2 和其他微量气体的影响


野火对大气、生态和社会有广泛的影响。本研究利用卫星数据和化学传输模型来分析 2018 年、2019 年和 2020 年 8 月至 10 月期间野火对加利福尼亚痕量气体的影响。在这几个月里，南加州的降水很少，导致高蒸气压亏欠，从而导致光合作用活动减少。这种减少，加上生物质燃烧的增加，导致 CO₂ 浓度升高。在 TROPOMI 检索中也观察到 CO 和 CH₄ 水平增加，这与生物质燃烧的增加有关。CarbonTracker 模型捕获了这些升高的 CO₂ 浓度，尽管 CO₂ 增加的幅度减小。同样，GEOS-Chem 模型成功地模拟了高 CO 水平，但低估了观察到的增强。这些发现将提高对火灾对痕量气体影响的理解，并改进未来关于地表排放和传输的数值模型。